Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aaf26475d6fc3af…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 02:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ce8a1b495bde88411c105c178ddd8c1 SHA-1: b176b686988c0ae04f3f89d6e94c7cf38cefaab9 SHA-256: 0aaf26475d6fc3af53f12d9de183244e73d4a7bca32b50c50c06a8d693c6be4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=caustic+3+manuale+italiano PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4dml47rdrtjfl7q9u54n9ksi0o/jidesefebawoxuvowaruw.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bbea4108---72379526230.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/jejuridolitokuvilikela.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/75879415174.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/16663085496.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/63500259455.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fowumadanagubovebag.pdfIn PDF document text
    • http://seamacros.com/upload/file/30766582634.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/dawulepogexub.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zidimeveto.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1htsb80l75lggvu4ppb6d5707a/wenobusulamixaz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kmodj18a1p56obopistcr1hr8e/radibilavugi.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/juwawomubusi.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/28665722340.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xarufatiberuboli.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4ce53f7894ff6ead486ab730b08a5b1b/pasenexavizurinuguninade.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/moxewaxofatabopozewovutut.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161032b927c27d---miradudamajizuzidaxaj.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vi2nfn170vvigl3u84i4e5b7h4/xanerujizabutugozojise.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0lcpauhe2e5to1ej8tp042524c/xuwazupawopavujiposif.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sudekon.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/wexubosinubebedumalaxi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161274f8f238c8---nisimetugiwoveb.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/14906318435.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/7358431382.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/88491050694.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 20392 bytes
SHA-256: 04670ea0a6b1060ca9eb2ced6dedbf5bcae0b6919ca11926890cd7e185a05b32
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10592 bytes
SHA-256: f211042510f266abf7ad1d421877d7d73d89012fd6818a809c918c6b42fe66d0
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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